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efi: Use more granular check for availability for variable services

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The UEFI spec rev 2.8 permits firmware implementations to support only
a subset of EFI runtime services at OS runtime (i.e., after the call to
ExitBootServices()), so let's take this into account in the drivers that
rely specifically on the availability of the EFI variable services.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Ard Biesheuvel
2020-01-23 09:12:00 +01:00
parent fe4db90a80
commit bf67fad19e
4 changed files with 11 additions and 23 deletions
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28
drivers/firmware/efi/efi.c
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@@ -328,12 +328,13 @@ static int __init efisubsys_init(void)
return -ENOMEM;
}
error = generic_ops_register();
if (error)
goto err_put;
if (efi_enabled(EFI_RUNTIME_SERVICES))
if (efi_rt_services_supported(EFI_RT_SUPPORTED_VARIABLE_SERVICES)) {
efivar_ssdt_load();
error = generic_ops_register();
if (error)
goto err_put;
platform_device_register_simple("efivars", 0, NULL, 0);
}
error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group);
if (error) {
@@ -358,7 +359,8 @@ static int __init efisubsys_init(void)
err_remove_group:
sysfs_remove_group(efi_kobj, &efi_subsys_attr_group);
err_unregister:
generic_ops_unregister();
if (efi_rt_services_supported(EFI_RT_SUPPORTED_VARIABLE_SERVICES))
generic_ops_unregister();
err_put:
kobject_put(efi_kobj);
return error;
@@ -650,20 +652,6 @@ void __init efi_systab_report_header(const efi_table_hdr_t *systab_hdr,
vendor);
}
#ifdef CONFIG_EFI_VARS_MODULE
static int __init efi_load_efivars(void)
{
struct platform_device *pdev;
if (!efi_enabled(EFI_RUNTIME_SERVICES))
return 0;
pdev = platform_device_register_simple("efivars", 0, NULL, 0);
return PTR_ERR_OR_ZERO(pdev);
}
device_initcall(efi_load_efivars);
#endif
static __initdata char memory_type_name[][20] = {
"Reserved",
"Loader Code",